Another Real Housewives couple bites the dust! Adrienne Maloofsplit from boyfriend Sean Stewart after a blowout fight at the Brent Foundation’s Annual Summer Spectacular benefit on Sunday. According to our witness, the duo arrived separately — and Adrienne walked the red carpet with a much younger mystery man.

“I have a lot of changes going on in my life,” the Real Housewives of Beverly Hills star tells Star. “I went through a period of darkness, and I am much happier now than ever. Things are good!”

Once inside the party, our insider saw Sean with his arm around Christine Peters, the mother of his ex-fiancée, while staring down Adrienne and her new guy. The mystery man approached Sean, who told his ex, “I’m done!” before storming out of the event.

“After Sean left the party, Adrienne came back inside and hung out in a cabana with her new man and his younger friends — and they couldn’t keep their hands off each other!” the witness reveals. “At one point, Adrienne was sitting in the guy’s lap, whispering in his ear.”

Adrienne divorced Paul Nassif in November 2012 and began dating Sean earlier this year.